One of the "Pure Michigan" slogans is: You're never more than 5 miles from a large body of water....
I believe it's the same "nationwide" when it comes to hardware stores, HD's and Lowe's.... You're never more than 5 miles from a source of "junk you should have had with you".... That said, between electrical, plumbing, suspension, camping, fishing, boating, firewood prep, cooking, relaxing, generator supply, pneumatic, (this list could go on forever) there's simply not enough space to carry "every emergency supply"...
This may not work for everyone's way of preparing, but for me, I took inventory on things that "probably would need repair" and carry tools for those systems. The other things, like propane, bodywork, paint, roof sealing, diesel engine repair, even welding equipment, I just leave that stuff at home and "statistically" I've never had a need for them while camping... Watch now, on my very next fishing trip, I'll knock a hole in the bottom of my aluminum boat and wish I had my TIG with me
IMHO, "exotic, seldom used tools and supplies" are much easier to just "run down to the hardware store and pick up" rather than try to rummage though all that "stored emergency supply of everything I didn't have room to store at home"..... If you've ever unloaded the front storage on a fifth wheel on a rainy Sunday afternoon, looking for that, "dammit I know it's here somewhere" part..... You know just how valuable that "trip to HD really can be".... YMMV